Get a hold of a small program called BattleLAN , run it on both pcs and allow firewall access ( it translates IP addresses so your PCs see it as a lan connection ). I've played against my brother in a different country successfully.Hope that helps.

you use hamachi its does LAN over long distances. then just search for yugioh power of chaos hamachi duels, and they will list a room and password to access there room where you can chat and setup a game with someone.